Seems to me it's like a prison, you need at least 12 or more feet of concrete from the ground up. More if possible, and whatever is anchored atop the concrete, bars, lattice work, etc., needs razor wire coiled along it.
The wall Israel built works. Copy it and stop pussy footing around with the distractions being thrown into the mix.
JMHo
Any kind of grinding on the fence would trigger the sensors. That would bring in the drones to track the fence disturbance. Then, manpower would converge on the offenders. Putting drugs through the slats has one problem: The receivers of the drugs have one big fence to protect them when they take off without paying.